1121020020 has 48 divisors (see below), whose sum is σ = 3487619520. Its totient is φ = 298938528.

The previous prime is 1121020009. The next prime is 1121020049. The reversal of 1121020020 is 200201211.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1121019984 and 1121020011.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1037442 + ... + 1038521.

It is an arithmetic number, because the mean of its divisors is an integer number (72658740).

Almost surely, 2^1121020020 is an apocalyptic number.

1121020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121020020 is an abundant number, since it is smaller than the sum of its proper divisors (2366599500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1121020020 is a wasteful number, since it uses less digits than its factorization.

1121020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075981 (or 2075973 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1121020020 is about 33481.6370567510. The cubic root of 1121020020 is about 1038.8139894634.

Adding to 1121020020 its reverse (200201211), we get a palindrome (1321221231).

The spelling of 1121020020 in words is "one billion, one hundred twenty-one million, twenty thousand, twenty".